src/audio/mint/SDL_mintaudio_it.S
author Patrice Mandin <patmandin@gmail.com>
Sat, 16 Sep 2006 09:15:11 +0000
branchSDL-1.2
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parent 1097 c83fa1c650dd
child 3866 afbcf97a5dd9
permissions -rw-r--r--
Only saved non preserved registers
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Library General Public
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    License as published by the Free Software Foundation; either
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    version 2 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Library General Public License for more details.
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    You should have received a copy of the GNU Library General Public
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    License along with this library; if not, write to the Free
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    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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/*
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	Audio interrupts
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	Patrice Mandin, Didier Méquignon
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 */
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	.text
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	.globl	_SDL_MintAudio_Callback
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	.globl	_SDL_MintAudio_XbiosInterrupt
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	.globl	_SDL_MintAudio_XbiosInterruptMeasureClock
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	.globl	_SDL_MintAudio_Dma8Interrupt
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	.globl	_SDL_MintAudio_StfaInterrupt
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	.globl	_SDL_MintAudio_mutex
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	.globl	_SDL_MintAudio_audiobuf
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	.globl	_SDL_MintAudio_numbuf
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	.globl	_SDL_MintAudio_audiosize
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	.globl	_SDL_MintAudio_clocktics
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	.globl	_SDL_MintAudio_stfa
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/*
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	How it works:
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	- Audio is playing buffer #0 (resp. #1)
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	- We must calculate a sample in buffer #1 (resp. #0)
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	  so we first call the callback to do it
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	- Then we swap the buffers
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*/
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#define	savptr	0x4a2
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#define	savamt	0x46
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/*--- Xbios interrupt vector to measure Falcon external clock ---*/
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_SDL_MintAudio_XbiosInterruptMeasureClock:          /* 1 mS */
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	btst	#0,0xFFFF8901:w	/* state DMA sound */
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	beqs	SDL_MintAudio_EndIntMeasure
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	addql	#1,_SDL_MintAudio_clocktics
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SDL_MintAudio_EndIntMeasure:
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	bclr	#5,0xFFFFFA0F:w	/* Clear service bit */
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	rte
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/*--- Xbios interrupt vector ---*/
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_SDL_MintAudio_XbiosInterrupt:
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	/* Reenable interrupts, so other interrupts can work */
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	movew	#0x2300,sr
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	/* Clear service bit, so other MFP interrupts can work */
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	bclr	#5,0xfffffa0f:w
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	/* Check if we are not already running */
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	tstw	_SDL_MintAudio_mutex
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	bnes	SDL_MintAudio_XbiosEnd
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	notw	_SDL_MintAudio_mutex
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	/* Swap buffers */
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	eorw	#1,_SDL_MintAudio_numbuf
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	moveml	d0-d7/a0-a6,sp@-
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	/* Callback */
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	jsr	_SDL_MintAudio_Callback
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	/* Reserve space for registers */
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	subl	#savamt,savptr
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	/* Set new buffer */
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	moveq	#0,d0
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	movel	_SDL_MintAudio_audiosize,d1
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	movew	_SDL_MintAudio_numbuf,d0
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	lsll	#2,d0
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	lea	_SDL_MintAudio_audiobuf,a0
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	movel	a0@(d0:l),a1
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	lea	a1@(d1:l),a2
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	movel	a2,sp@-
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	movel	a1,sp@-
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	clrw	sp@-
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	movew	#131,sp@-
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	trap	#14
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	lea	sp@(12),sp
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	/* Restore registers space */
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	addl	#savamt,savptr
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	moveml	sp@+,d0-d7/a0-a6
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	clrw	_SDL_MintAudio_mutex
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SDL_MintAudio_XbiosEnd:
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	rte
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/*--- DMA 8 bits interrupt vector ---*/
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_SDL_MintAudio_Dma8Interrupt:
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	/* Reenable interrupts, so other interrupts can work */
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	movew	#0x2300,sr
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	/* Clear service bit, so other MFP interrupts can work */
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	bclr	#5,0xfffffa0f:w
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	/* Check if we are not already running */
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	tstw	_SDL_MintAudio_mutex
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	bnes	SDL_MintAudio_Dma8End
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	notw	_SDL_MintAudio_mutex
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	/* Swap buffers */
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	eorw	#1,_SDL_MintAudio_numbuf
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	moveml	d0-d1/a0-a1,sp@-
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	/* Callback */
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	jsr	_SDL_MintAudio_Callback
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	/* Set new buffer */
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	moveq	#0,d0
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	movew	_SDL_MintAudio_numbuf,d0
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	lslw	#2,d0
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	lea	_SDL_MintAudio_audiobuf,a0
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	movel	a0@(d0:w),d1
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	/* Modify DMA addresses */
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	lea	0xffff8900:w,a0
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	moveb	d1,a0@(0x07)	/* Start address */
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	rorl	#8,d1
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	moveb	d1,a0@(0x05)
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	rorl	#8,d1
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	moveb	d1,a0@(0x03)
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	swap	d1
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	addl	_SDL_MintAudio_audiosize,d1
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	moveb	d1,a0@(0x13)	/* End address */
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	rorl	#8,d1
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	moveb	d1,a0@(0x11)
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	rorl	#8,d1
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	moveb	d1,a0@(0x0f)
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	moveml	sp@+,d0-d1/a0-a1
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	clrw	_SDL_MintAudio_mutex
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SDL_MintAudio_Dma8End:
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	rte
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/*--- STFA interrupt vector ---*/
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STFA_SOUND_START	=	6
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STFA_SOUND_END		=	STFA_SOUND_START+8
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_SDL_MintAudio_StfaInterrupt:
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	/* Reenable interrupts, so other interrupts can work */
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	movew	#0x2300,sr
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	/* Check if we are not already running */
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	tstw	_SDL_MintAudio_mutex
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	bnes	SDL_MintAudio_StfaEnd
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	notw	_SDL_MintAudio_mutex
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	/* Swap buffers */
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	eorw	#1,_SDL_MintAudio_numbuf
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	moveml	d0-d7/a0-a6,sp@-
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	/* Callback */
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	jsr	_SDL_MintAudio_Callback
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	/* Set new buffer */
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	moveq	#0,d0
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	movel	_SDL_MintAudio_stfa,a1
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	movew	_SDL_MintAudio_numbuf,d0
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	lslw	#2,d0
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	lea	_SDL_MintAudio_audiobuf,a0
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	movel	a0@(d0:w),d1
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	/* Modify STFA replay buffers */
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	movel	d1,a1@(STFA_SOUND_START)
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	addl	_SDL_MintAudio_audiosize,d1
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	movel	d1,a1@(STFA_SOUND_END)
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	moveml	sp@+,d0-d7/a0-a6
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	clrw	_SDL_MintAudio_mutex
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SDL_MintAudio_StfaEnd:
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	rte